P1112 - Intake Air Temperature Sensor Intermittent

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What does this mean?

P1112 Possible Causes

  • Faulty Intake Air Temperature Sensor
  • Intake Air Temperature Sensor harness is open or shorted
  • Intake Air Temperature Sensor circuit poor electrical connection
  • Damaged Powertrain Control Module (PCM)

How do I fix code P1112

    Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

P1112 Tech Notes

Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor. Monitor the IAT on a scan tool. Look for sudden changes in the reading when the harness is wiggled or the sensor is tapped.

Cost of diagnosing the P1112 code

    Labor: 1.0

    The cost of diagnosing the P1112 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

P1112 Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1112 Meaning

The IAT sensor is a thermistor device in which resistance changes with temperature. The electrical resistance of a thermistor decreases as the temperature increases, and the resistance increases as the temperature decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical signals to the Powertrain Control Module (PCM) corresponding to temperature.
Thermistor-type sensors are considered passive sensors. A passive sensor is connected to a voltage divider network so that varying the resistance of the passive sensor causes a variation in total current flow. Voltage that is dropped across a fixed resistor in a series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.
The IAT sensor provides air temperature information to the PCM. The PCM uses the air temperature information as a correction factor in the calculation of fuel, spark, and air flow.
The IAT sensor provides a quicker temperature change response time than the ECT or CHT sensor.
Currently there are 2 types of IAT sensors used, a stand alone, non-integrated type and an integrated type. Both types function the same, however the integrated type is incorporated into the mass air flow (MAF) sensor instead of being a stand-alone sensor.
OBDII Code P1112 - Intake Air Temperature Sensor Intermittent  - Engine-Codes.com

P1112 More Information

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P1112 Information for specific makes

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  • P1112 FORD Intake Air Temperature Sensor Intermittent Condition
  • P1112 GMC Intake Air Temperature Sensor Circuit Intermittent Low Voltage
  • P1112 HONDA Intake Air Temperature Sensor Circuit Intermittent Low Voltage
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  • P1112 JEEP Intake Air Temperature Sensor Circuit Intermittent Low Voltage
  • P1112 KIA Intake Air Temperature Sensor Circuit Intermittent Low Voltage
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  • P1112 MERCURY Intake Air Temperature Sensor Intermittent Condition
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  • P1112 PONTIAC Intake Air Temperature Sensor Circuit Intermittent Low Voltage
  • P1112 SATURN Intake Air Temperature Sensor Circuit Intermittent Low Voltage
  • P1112 SUBARU Atmospheric pressure sensor range/performance problem
  • P1112 SUZUKI Intake Air Temperature Sensor Circuit Intermittent Low Voltage
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